Background Color

Replace the background of a portrait or product shot with a flat color. Pick any RGB value; shading_percent baked at 30% for soft falloff.

Pricing: $0.12/request. Endpoint: POST /v1/models/runflow/background-color/runs.

Replace the background of a portrait or product shot with a flat color. Pick any RGB value; shading_percent baked at 30% for soft falloff.

Overview

• Endpoint: https://api.runflow.io/v1/models/runflow/background-color/runs
• Model ID: runflow/background-color
• Provider: Runflow
• License: commercial
• Last Updated: 2026-04-28

Pricing

• Base price: $0.12/request
• Note: Per image - background color replacement

Background Color API

Endpoint: POST /v1/models/runflow/background-color/runs

Run the model

Python

import requests

response = requests.post(
    "https://api.runflow.io/v1/models/runflow/background-color/runs",
    headers={"Authorization": "Bearer RUNFLOW_API_KEY"},
    json={
        "input": {
            "color_red": 245,
            "image_url": "https://public.runflow.io/images/models/runflow/background-color/examples/1/before.webp",
            "color_blue": 200,
            "color_green": 220
        },
        "callback_url": "https://your-server.com/webhook"
    },
)

data = response.json()
print(data)

Node.js

const response = await fetch(
  "https://api.runflow.io/v1/models/runflow/background-color/runs",
  {
    method: "POST",
    headers: {
      "Authorization": "Bearer RUNFLOW_API_KEY",
      "Content-Type": "application/json",
    },
    body: JSON.stringify({
        "input": {
            "color_red": 245,
            "image_url": "https://public.runflow.io/images/models/runflow/background-color/examples/1/before.webp",
            "color_blue": 200,
            "color_green": 220
        },
        "callback_url": "https://your-server.com/webhook"
    }),
  }
);

const data = await response.json();
console.log(data);

cURL

curl -X POST https://api.runflow.io/v1/models/runflow/background-color/runs \
  -H "Authorization: Bearer $RUNFLOW_API_KEY" \
  -H "Content-Type: application/json" \
  --data-binary @- <<'JSON'
{
    "input": {
        "color_red": 245,
        "image_url": "https://public.runflow.io/images/models/runflow/background-color/examples/1/before.webp",
        "color_blue": 200,
        "color_green": 220
    },
    "callback_url": "https://your-server.com/webhook"
}
JSON

Request parameters

Parameter	Type	Required	Description
input	object	required	Model input parameters. See “Input schema” below.
callback_url	string | null	optional	Webhook URL - POSTed when the run reaches a terminal state.
metadata	object | null	optional	Arbitrary key-value pairs attached to the run.

Input schema

Field	Type	Required	Allowed values	Description
image_url	image	required	Any	URL of the image to process. HTTPS required.
color_red	integer	required	Any	Red channel 0–255.
color_green	integer	required	Any	Green channel 0–255.
color_blue	integer	required	Any	Blue channel 0–255.

Output schema

Field	Type	Description
outputs	json	Array of result items, each with at minimum a url field.
seed	json	Random seed used (null if N/A).
timing	json	Provider timing breakdown (null if not surfaced).
nsfw_detected	json	Provider NSFW flag (null if not surfaced).

Callback payload

When you provide a callback_url, Runflow POSTs to it once the run reaches a terminal state.

Field	Type	Description
event	string	Event type: “run.completed”, “run.failed”, or “run.cancelled”.
run_id	string	The unique identifier of the run.
status	string	Terminal status: “succeeded”, “failed”, or “cancelled”.
output	object | null	The run output. Null if the run failed or was cancelled.
duration_ms	number | null	Total run duration in milliseconds.
created_at	string | null	ISO 8601 timestamp when the run was created.
completed_at	string | null	ISO 8601 timestamp when the run reached terminal state.
metadata	object | null	The metadata object passed at run creation, if any.

• Retries: 3 attempts with exponential backoff (1s, 2s). Retries on 5xx / network errors only.
• Headers: Runflow-Request-Id is always sent. Runflow-Signature is sent if a signing secret is configured.

Additional Resources

• Playground
• API Reference
• Documentation
• OpenAPI

Related

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Run lifecycle

Callbacks, polling, statuses.

Callbacks

Handle async results.

Pricing

How requests bill out.